Cambridge IAL Mathematics Practice Questions - Cambridge International A-Level Mathematics (9709) Exam

Express x^2 - 8x + 21 in the form (x - a)^2 + b.

(x - 4)^2 + 5 (x - 4)^2 + 21 (x - 8)^2 + 5 (x + 4)^2 + 5

Correct Answer:

(x - 4)^2 + 5

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